Finding the Fourth Proportional to 9,140.56, 13,710.72 and 2,215.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,140.56 : 13,710.72 = 2,215.12 : x
2. Step 2: Convert to fraction form
   9,140.56/13,710.72 = 2,215.12/x
3. Step 3: Cross multiply
   9,140.56x = 13,710.72 × 2,215.12
4. Step 4: Simplify right side
   9,140.56x = 30,370,890.09
5. Step 5: Solve for x
   x = 30,370,890.09/9,140.56
6. Step 6: Final answer
   x = 3,322.65